Albert Lie 이영덕 albertlieyingadrian

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

Create Root CA (Done once)

Last update: Nov 2025.

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl ecparam -genkey -name secp384r1 | openssl ec -aes256 -out rootCA.key

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

"A little bit of slope makes up for a lot of y-intercept"

01/13/2012. From a lecture by Professor John Ousterhout at Stanford, class CS140

Here's today's thought for the weekend. A little bit of slope makes up for a lot of Y-intercept.

[Laughter]

Golang Workers / Job Queue

A running example of the code from:

This gist creates a working example from blog post, and a alternate example using simple worker pool.

TLDR: if you want simple and controlled concurrency use a worker pool.

	import java.util.HashMap;
	import java.util.Map;
	import java.util.Scanner;

	/**
	* Credit for Algorithm from top answer in:
	* http://stackoverflow.com/questions/7116438/algorithms-question-flipping-columns
	*
	* This problem is given to interview candidates in the screening process
	* for Palantir Technologies. I've seen it through several different

	chrome.webRequest.onHeadersReceived.addListener(
	function (details) {
	for (var i = 0; i < details.responseHeaders.length; ++i) {
	if (details.responseHeaders[i].name.toLowerCase() == 'x-frame-options') {
	details.responseHeaders.splice(i, 1);
	return {
	responseHeaders: details.responseHeaders
	};
	}
	}

	<!DOCTYPE HTML>
	<meta charset="utf-8">
	<html>
	<head>

	<link rel="stylesheet" type="text/css" href="http://fonts.googleapis.com/css?family=Source+Sans+Pro:400italic,600italic,700italic,200,300,400,600,700,900">
	<script src="http://d3js.org/d3.v3.min.js"></script>

	<style>

	$ cat test.js
	function foo () { while (true) { } }
	function bar () { return foo(); }
	bar();
	$ node test.js &
	$ gdb attach $(pidof node)
	0x00000bf778c63d5f in ?? ()
	(gdb) b v8::internal::Runtime_StackGuard
	Breakpoint 1 at 0x84a1f0
	(gdb) print 'v8::V8::TerminateExecution'(0)

	// Reference: http://stackoverflow.com/questions/4822471/count-number-of-lines-in-a-git-repository

	$ git ls-files \| xargs wc -l